22686728 has 8 divisors (see below), whose sum is σ = 42537630. Its totient is φ = 11343360.

The previous prime is 22686707. The next prime is 22686731. The reversal of 22686728 is 82768622.

It can be written as a sum of positive squares in only one way, i.e., 18852964 + 3833764 = 4342^2 + 1958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1417913 + ... + 1417928.

Almost surely, 2^22686728 is an apocalyptic number.

It is an amenable number.

22686728 is a deficient number, since it is larger than the sum of its proper divisors (19850902).

22686728 is a wasteful number, since it uses less digits than its factorization.

22686728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835847 (or 2835843 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 22686728 is about 4763.0586811418. The cubic root of 22686728 is about 283.0896260386.

The spelling of 22686728 in words is "twenty-two million, six hundred eighty-six thousand, seven hundred twenty-eight".